Head Tracking
Head-Tracker (HT)
Head-Tracker Gyros are very popular when used with video goggles and a Pan and Tilt servo set up for FPV pilots. The Head-Tracker sends the pilot head movements to the servos that are mounted to the camera giving you the ability to look around from the RC aircraft (also known as HT/HAT). Most Head-trackers require you to plug them in through the trainer port on your radio and then programming of the radios trainer menu to assign channels to control the aircrafts pan & tilt servos. Futaba 7 channel or higher (FF7/7C, FF9/9C, 12Z, 14MZ), is recommended or any radio that allows trainer port programming but check with the manufacture of the Head-Tracker gyro you plan on using for compatibility. If you don't have a compatible radio then a separate radio can be used to operate Head-Tracker and Pan n Tilt servos if you don't mine digging into it. This requires some basic knowledge of RC radio equipment and you will be transmitting on 2 frequency at the same time so this can be a problem if you fly at a club field where flyers have to wait for available frequency.
As of now HT's have some small issues that cause the servos not to return to center when the pilots head re-centers straight so a push button (included with HT) needs to be placed in reach of your fingers that when you push the button the cameras servos re-center. The main reason this this happens is the inability for the Head Tracker to calculate diagonal head movements. This button is also commonly used for programming the Head Tracker gyro.
Programming a HT's is mainly selecting what 2 channels you want the HT to be assigned too like for example Tilt maybe assigned to Radio TX channel 7 and Pan assigned to channel 8, usually any Channel from 1 to 8 can be selected.
Here in this video JMSTECH demostrates how a Head Tracker (HT) operates with Pan & Tilt servos.